The most common cause of uneven pigmentation like this is a condition known as pityriasis versicolor. It is caused by an overgrowth of the yeasts that are normally found in small numbers on the skin.

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The first documented cases of blotchy bass in the state were recorded in 1986 in Lake Erie, he said. It’s still unclear just how widespread the syndrome has become since then, Smith said.

MyDNR, Indiana’s Outdoor Newsletter: Blotchy bass syndrome (BBS) is the occurrence of black ink-like spots (hyperpigmentation) on the skin, fins, and/or mouths of freshwater bass species. Researchers ...